I take mine out at day 14 because I read something that was very similar. I'm going to stop turning my duck eggs 7 days before the hatch date just like I would with the chicken eggs because at that point the duckling should be big enough to turn themselves in the egg. I don't see a huge duckling getting stuck on the membrane because it wasn't turned.
I think us humans tend to overthink a lot of things especially when it comes to incubating. I see it all the time where people are so worried about every little detail and when I was like that, my hatch was so horrible. It seems the less I worry about stuff the better my hatches come out.
My first hatch I was by the book and listened to the incubator instructions that came with my incubator... Big mistake. they don't tell you in those booklets that if you're in a humid area you should not add water. So you can imagine the terror that I went through being on the East coast in a humid environment.
I had several chicks that I know would have lived that I think drowned because of the humidity because their air cells were small. I hate blaming myself and thinking of the what ifs, but there's nothing else I can do besides that. After that hatch I decided I wasn't going to go by the book and I was going to do my own thing.
Whatever works for you! Just keep doing it.
